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"Geometry of 2-dimensional spheres"

Dr. Regina Rotman, University of Toronto

Wednesday, March 13, 2013
  3:40–5 p.m.


Location: Surge Building 284
  Parking Information

Category: Colloquium

Description: Tea time @ 3:40 p.m.

Talk begins @ 4:10 p.m.

Ends @ 5:00 p.m.

Abstract:


I will discuss some geometric inequalities that are valid for Riemannian manifolds diffeomorphic to the sphere of dimension 2.


For example, consider the following basic question: Suppose a simple closed curve $\gamma$ on a Riemannian sphere M of diameter D can be contracted to a point in M over simple closed curves of length at most L. Is there a homotopy over loops based at some point of $\gamma$ that are short compared to L and D? The answer to this question is positive. (Joint with G. Chambers.)


I will also prove that for any positive k and any two points of M there exist at least k geodesics connecting them of length at most 22kD. (Joint with A. Nabutovsky.)


 

Additional Information: Math Colloquiums

Open to: General Public
Admission: Free
Sponsor: Mathematics

Contact Information:
Dr. Fred Wilhelm

wilhelm@math.ucr.edu